All my guinea pig is doing is sleeping then she’ll eat but then pass out again she doesn’t wheek at all she isn’t eating the vitamin c hat based tabs she just sits in the corner most of the time
Hi and welcome!
Guinea pigs are prey animals that live in groups and that not wired to live on their own. Sadly so far Switzerland is still the only country where it is officially against the law to sell and own single guinea pigs although other countries have tightened up their welfare standards.
Companionship
Your little one is feeling very lost and very depressed. As a pet store piggy she has never had anything in the way of friendly interaction with humans. Unfortunately, all those 'cute' videos on social media don't reflect reality and don't prepare you for the real guinea pigs, which are are not living instant cuddly toys. But who wants to see videos of piggies hiding and running away?

Can you really replace the 24/7 round the clock companionship for the next 5-7 years of a normal healthy life span? While your life develops and you have other commitment and interests, her need for constant interaction and stimulation is the same, every single day, whether you have the time and interest or not. She cannot simply go anywhere else...
This link here tells you how being sold at a pet shop looks from her side:
Arrival in a home from the perspective of pet shop guinea pigs
Here are tips on how you can make friends with her in her own social interactive language:
Understanding Prey Animal Instincts, Guinea Pig Whispering And Cuddling Tips
How to pick her up and carry her safely:
How To Pick Up And Weigh Your Guinea Pig Safely
The best and most loving gift you can ever make a guinea pig is a same sex companion of her their own kind. Please double check the gender of both piggies before you introduce them on neutral ground outside the cage.
New guinea pigs: Sexing, vet checks&customer rights, URI, ringworm and parasites
Most piggies don't like artificial vitamin C but with a diet of unlimited good quality hay. Hay should make around 80% of the daily food intake and which is crucial for long health and a long life. What most people don't know is that decent quality green hay actually contains vitamin C. Fresh green growing grass is high in it and the reason why guinea pigs never had the need to make their own in the first place. About 50g of veg and fresh herbs but ideally no or only very little fruit and 1 tablesoon or 1/8 cup (both amount to 15 ml) of pellets provide the rest. If you include veg and herbs high in vitamin C in the daily mix and buy decent quality nuggets (no dry mix), then there is more vitamin C in both food groups so that additional vitamin C is not necessary. Mine have never had any extra vitamin C but they mostly live to a good old age and I have never had issues with scurvy in all those years - nor have other long term forum members.
Here is our very detailed and practical diet guide with a sample veg diet picture:
Long Term Balanced General And Special Needs Guinea Pig Diets
Please make sure that she is healthy and eating by weighing your piggy regularly on your kitchen scales; once weekly for a healthy piggy and daily at the same time for a piggy you are worried about.
Weight - Monitoring and Management